I have a rebuilt SB 350 that I did myself a while back. Was using 20-50W oil and never had a leak. I just changed my oil 2 weeks ago to a little bit thinner oil and now I keep having an oil leak somewhere around the fuel pump. The problem is, I cannot see where it is leaking!! It doesn't leak when idling or if I rev it some and then check it. But if I drive it and get up around 50-55 it leaks alot and gets on my headers and all down around the passenger side of the motor and suspension. I don't get it!! Anyone have any ideas? It is driving me nuts!!
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